Description

The AD5781 is a single 18-bit, unbuffered voltage-output DAC that operates from a bipolar supply of up to 33 V. The AD5781 accepts a positive reference input in the range 5V to VDD – 2.5 V and a negative reference input in the range VSS + 2.5 V to 0 V. The AD5781 offers a relative accuracy specification of ±0.5 LSB max, and operation is guaranteed monotonic with a ±0.5 LSB DNL maximum specification.The part uses a versatile 3-wire serial interface that operates at clock rates up to 35 MHz and that is compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The part incorporates a power-on reset circuit that ensures the DAC output powers up to 0 V and in a known output impedance state and remains in this state until a valid write to the device takes place. The part provides an output clamp feature that places the output in a defined load state.PRODUCT HIGHLIGHTS True 18-Bit Accuracy. Wide Power Supply Range of Up to ±16.5 V. −40°C to +125°C Operating Temperature Range. Low 7.5 nV/√Hz Noise. Low 0.05 ppm/°C Temperature Drift.APPLICATIONS Medical Instrumentation Test and Measurement Industrial Control Scientific and Aerospace Instrumentation Data Acquisition Systems Digital Gain and Offset Adjustment Power Supply Control